The cell wall of fungi is made up of chitin.
$(i)$ What is the chemical nature of chitin?
$(ii)$ What is the mode of nutrition in fungi?

What is the difference between algae and fungi?

Hard calcium carbonate structures are used as a skeleton by

Name an organism sensitive to $SO_{2}$ in air.

Give examples for the following:
$(a)$ Bilateral,dorsiventral symmetry is found in ...............
$(b)$ Worms causing disease elephantiasis is ..............
$(c)$ Open circulatory system is found in ............. where coelomic cavity is filled with blood.
$(d)$ ............... are known to have pseudocoelom.

Classify the following organisms based on the absence $/$ presence of true coelom,i.e.,acoelomate,pseudocoelomate,and coelomate:
$(a)$ Scorpion
$(b)$ Sea anemone
$(c)$ Ascaris
$(d)$ Earthworm
$(e)$ Wuchereria
$(f)$ Nereis